Abstract
The electrocatalytic efficiency and stability have become the most significant topics in the catalytic application of fuel cells. In this work, the carbon-supported amorphous NiCo2O4 decorated Pd composite nanoparticles (Pd/NiCo2O4/C) was fabricated by means of the facile hydrothermal and reduction to investigate the electrocatalytic performance. The cyclicvoltammetry measurements show that the larger electrochemical active surface area (135.00 m2 g−1), increased peak current density (160.99 mA cm−2) and lower onset potential (−0.70 V) are obtained in Pd/NiCo2O4/C catalysts compared to the commercial Pd/C with the Pd loading (10 wt.%), indicating that a significantly enhanced electrocatalytic activity for ethanol oxidation in Pd/NiCo2O4/C catalysts. More importantly, the Pd/NiCo2O4/C catalyst also presents the long-time stability during the ethanol oxidation reaction. The X-ray powder diffraction, X-ray photo-electron spectroscopy and transmission electron microscopy measurements were carried out to further demonstrate that there exists the strong chemical interaction between Pd and amorphous NiCo2O4 nanoparticles, which leads to the formation of the more electrochemical active sites via redistributing the electronic structure of Pd and boosting anti-poisoning ability of intermediates. Our study provides a high-performance and promising electrocatalytic material, which can be applied to the direct ethanol fuel cells.
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